If my work permit was issued in Phuket, will I be able to do all immigration-related things in Bangkok (such as 90 day reporting, extensions, etc.)? For my arrival card, I wrote in a Bangkok address
TLDR : Answer Summary
Yes, you can handle immigration-related tasks such as 90-day reporting and extensions in Bangkok, even if your work permit was issued in Phuket. The key factor is your registered address for immigration matters, not necessarily where your work permit was issued.